本文探讨了使用IN运算符的多种优势，包括提高SQL语句的可读性和管理性，执行速度更快，以及能够嵌套SELECT语句实现高度动态的WHERE子句。
Why use the IN operator? The advantages are
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When you are working with long lists of valid options, the IN operator syntax is far cleaner and easier to read.
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The order of evaluation is easier to manage when IN is used (as there will be fewer operators used).
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IN operators almost always execute more quickly than lists of OR operators.
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The biggest advantage of IN is that the IN operator can contain another SELECT statement, enabling you to build highly dynamic WHERE clauses.
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